The series contains primary source material on families that had a connection to the Dericks. It consists of research notes, newspaper clippings, family registers, correspondence, legal documents, scrapbooks, The series is comprised of the following files; Andrews, J.R (1883-[18--?]), Beerwort (1942-[19--?]), Brisbin, James Thomas (1848), Christie, Gabriel ([19--?]), Cochrane, Frank ([19--?]), Colton ([197-?]-[199-?]), Cutting ([19--?]-[1993?]), Eaton, Wyatt ([197-?]-[199-?]), Flagg ([1834?]-[1993?]), Friott ([19--?]), Geer ([197-?]), George ([1828?]-[2003?]), George, B.C (1979), Hawley ([1789]-[19--?]), Holt ([19--?]), Hunt ([1991?]), Hunter ([19--?]), Huntington([19--?]), Hulbert ([1978?]-[199-?]), Hurd (1968-1972), Huxley (1995), Johnson ([1972?]-[199-?]), Kemp, James (1832-[19--?]), Lambie ([19--?]), Livingston, Darcy Gary (1970-[198-?]), Longeway ([197-?]), Luke ([19--?]), Lyon, C.G ([196-?]), MacCallum ([19--?]), MacDowell, Thain Wendell (1816-[2002?]), MacFie ([19--?]), Mitchell (1993), Mock ([198-?]-[199-?]), Naylor, Donald ([1914?]-[199-?]), O'Connor ([19--?]), O'Hea, Timothy ([1988?]), Odell ([1844?]-[19--?]), Patterson, Richard (1960-[198-?]), Robinson ([196-?]), Rowe- Hewson ([1918?]-[198-?]), Ruiter ([198-?]-[199-?]), Ryan ([19--?]), Saxe ([19--?]), Scott ([197-?]), Shand ([1971?]-[197-?]), Snider ([19--?]), Stewart, Rev. Charles James ([19--?]), Stevens ([199-?]), Stone (1975), Struthers ([195-?]-[199-?]), Taylor, Rev. Ernest ([1938?]-[19--?]), Townsend ([18--?]-[19--?]), Van Vliet (1889-1993), Vaughan ([1989]-[1993?]), Williams (1854-[19--?]), and Young ([198-?]-[199-?]).

The series contains primary source material on indexes of cemeteries in the Eastern Townships. The series is comprised of the following files; Arthabaska County ([1958?]-[197-?]), Brome County (1972), Compton County ([197-?]), Drummond County (1969-1971), Huntingdon County ([197-?], Lotbinière County (1970), Megantic County (1972), Missisquoi County ([196-?]-[197-?]), Richmond County ([196-?]-[197-?]), St-Jean County ([196-?]), Shefford County ([196-?]), Sherbrooke County (1968-1973), Stanstead County (1968-1970), and Others ([1966?]-1986).

The series contains primary source material on ledgers dating from 1848 to 1919. It consists of two ledgers. The series contains the following files; William J. Derick (ca. 1864) and Mansonville House (1876-1919).

The series contains primary source material on account books dating from 1848 to [1989?]. It consists of six books. The series is comprised of the following files; Cleveland, Carmichael & Co. (1853-1885), Foster & Co. (1848-[185-?]), William J. Derick (ca. 1886), James Quig & James Carbonneau ([1906?]-[1989?]), Unidentified ([1863?]-[1889?]), and School Commissioners (1916-1935).

The sub-series contains primary source material on photographs of families connected to the Derick family. The sub-series is comprised of the following files; MacFie ([19--?]-[195-?]), Struthers ([18--?]-1988), Luke ([19--?]), Herbert G. Wilson ([19--?]), John Gilmore ([19--?]), Simpson ([19--?]), Naylor ([19--?]-1958), Geer ([18--?]-[19--?]), Thompson (1897), Eaton ([19--?]), Hunter ([186-?]-[189-?]), Townsend ([18--?]), Nolen ([19--?]), Scott ([19--?]), Stevens (1992), EB Taylor ([1919?]), George ([18--?]-[19--?]), Darby (1820-1928), Group Photographs ([1900?]-[19--?]) C.G Lyon ([19--?]), Kenneth Clarkson ([194-?]), Bishop Fulford ([18--?]), and E.H O'Toole (1940).

The sub-series contains primary source material on photographs of unidentified people.

The series contains primary source material on the personal and professional activities of Herbert Ray Derick from 1916 to 1994. It consists of correspondence, legal documents, pamphlets, newspaper clippings, scrapbooks, financial statements, newsletters, and baptism certificate. The series is comprised of the following sub-series; Professional life ([1941?]-1993) and Personal life (1916-1994).

The sub-series contains primary source material on the personal activities of Herbert Derick from 1916 to 1994. It consists of correspondence, scrapbooks. The sub-series is comprised of the following files; Hereford Fish and Game Club (ca. 1971), Highlanders Fish and Game Club (1988), Compton Fish and Game Club (1975-1984), Ex-Air Gunner's Association of Canada Inc. (1992), United Empire Loyalists' Association of Canada (ca. 1968-1993), Missisquoi County Historical Society (ca. 1966-1976), Brome County Historical Society ([1959?]-1976), Protestant Colonization Society (1958), Other organizations (1955-1989), Scrapbooks ([196-?]-[199-?]), Vital statistics (1916-1994), and Correspondence ([1971?]-1993).

The series contains primary source material on research material on various towns, topics, and places within the Eastern Townships. It consists of newspaper clippings, notes, correspondence, scrapbooks, pamphlets, burial information, and petitions. The series contains many photocopied documents. The series is comprised of the following files; Alburg ([19--?]), Anticosti Island ([19--?], Archives: Ottawa and Quebec (1968-1984), Army Commissions ([19--?]), Ash Island ([199-?]), Ashmun, Jehudi (1959), Bedford County (1820-1991|), Beebe ([197-?]), Boundary line (1972), British American Land Company (1969), Caldwell and Christie Manor (1827-[198-?]), Census Reports Eastern Townships ([19--?]), Census Extracts USA ([19--?]), Chambly ([197-?]), Christ Church & Caldwell Manor ([197-?]-[199-?]), Cassville (1988), Clarenceville (1890-[198-?]), Clarenceville Scrapbook ([18--?]), Clarenceville Methodist Church ([19--?]), Commissioners Court Clarenceville ([1836]-[19--?]), Coaticook (1894), Drummondville: Southern Canada Power Company ([193-?]-[195-?]), Dunham (1968), Eastern Townships ([19--?]), First Lacolle Company Canadian Girl Guides ([19--?]), Foucalt Cadastre ([19--?]), German Settlers in Eastern Townships ([198-?]), Gilhead Lutheran Church Baptisms (1990), Hatley (1991), Henryville (1822-1993), Isle aux Noix (1901-[1971?]), Isle la Motte (1975), Lacolle (1890-[19--?]), Land Grants ([19--?]), Land Petitions Hemmingford ([19--?]), Lennoxville ([19--?]-1990), Lower Canada Settlers ([19--?]), Maine Mining Maps ([19--?]), Mansonville ([1882?]-1976), Masonic Lodges (1817-1976), Methodist Church ([1989?]), Missisquoi Loyalists: Vermont Historical Society (1938), Napierville and Douglas Corner (1956-1990), Notary records ([199-?]), Noyan ([196-?]-[199-?]), Odelltown ([19--?]), Orford Mountain Railroad (1909), Owl's Head ([19--?]), Philipsburg ([19--?]), Pike River ([19--?]), Protestant Colonization & Settlement Society of Montreal (1960), Rebellion Claims (1838-1849), Richelieu Bridge Co. (1885-1967), Seignory Records ([19--?]), Sherbrooke ([192-?]-[197-?]), Sorel ([199-?]), Stanstead (1973), St. Armand (1853-[19--?]), St. John's Richelieu(1852-1904), St. Vallier Mailloux ([19--?]), Taylor Petition ([19--?]), and Ticonderoga ([19--?]).

The sub-series contains primary source material on postcards of various locations within the Eastern Townships and outside as well. It also consists of postcards of soldiers.