Progress report - Commonwealth of Pennsylvania, Department of Internal Affairs, Bureau of Topographic and Geologic Survey.
APA Citation
Pennsylvania. Bureau of Topographic and Geologic Survey. (1919). Progress report - Commonwealth of Pennsylvania, Department of Internal Affairs, Bureau of Topographic and Geologic Survey. Harrisburg: Pennsylvania Geological Survey.
MLA Citation
Pennsylvania. Bureau of Topographic and Geologic Survey. Progress Report - Commonwealth of Pennsylvania, Department of Internal Affairs, Bureau of Topographic And Geologic Survey. Harrisburg: Pennsylvania Geological Survey, 1919.
Warning: These citations may not always be complete (especially for serials).