United States. Library of Congress, Savage, H., Droste, K. D., & Runshock, R. (1987). Library of Congress classification schedules combined with additions and changes through 1986 Class D: History : General and Old World ; part 2 : Index. Gale Research Inc.

United States. Library of Congress, Helen Savage, Kathleen D. Droste, and Rita Runshock. Library of Congress Classification Schedules Combined with Additions and Changes Through 1986 Class D: History : General and Old World ; Part 2 : Index. Detroit: Gale Research Inc, 1987.

United States. Library of Congress, et al. Library of Congress Classification Schedules Combined with Additions and Changes Through 1986 Class D: History : General and Old World ; Part 2 : Index. Gale Research Inc, 1987.