Appendix to Nineteenth Annual Report of the Director of the United States Geological Survey. Triangulation and spirit leveling, p. 145.
Index, p. 409.
Part I: Director's report, including triangulation and spirit leveling, p. 3.
Table of contents, p. 5.
Electronic reproduction. Chester, Vt.: NewsBank, inc., 2006. Available via the World Wide Web. Access restricted to Readex U.S. Congressional Serial Set subscribers.