Baldwin's map of mining claims near Leadville, California Mining District, Lake Co. Colorado.Baldwin and Company[1879?]"Claims which have been surveyed for a patent are designated by the official no.""Entered according to act of Congress A.D. 1879, by Baldwin and Co., with the Librarian of Congress, at Washington, D.C. [paste-over].""F.L. Sizer, Draughtsman."Shows mining claims, placer claims (producing mines indicated), gulches, creeks, towns, claim group names, and sections.cartographic