Harvard Encyclopedia of American Ethnic Groups . Stephen Thernstrom, ed. Belknap Press of Harvard University Press, 1980. Signed essays on 106, ethnic groups including Mormans, the Amish, etc. Each article touches on origins, migration, arrival, settlement, economic and social life, religion, culture, education, politics, and maintenance of ethnicity.
Brief bibliographies stress easily obtainable books.
Harvard Guide to American History . Frank Friedel, ed. Belknap Press of Harvard University Press, 1974. Topical and chronological arrangement of materials on research methods and materials, biographies and personal records, comprehensive and area histories and histories of special subjects. Detailed table of contents.