The story of the Pennsylvania survey
By: by George H. Ashley.
Contributors: Pennsylvania. Bureau of Topographic and Geologic Survey.
Series: [Pennsylvania] Bureau of topographic and geologic survey. Misc. papers:; no. 1
Publisher: Dept. of internal affairs, Bureau of topographic and geologic survey
Published: 1920
Place of publication: Harrisburg
Language: eng
Number of pages: 20
Notes: At head of title: ... The Pennsylvania survey.