Thanks to Jerry Bryant for making available this Rand McNally & Co.'s Map: Northern Portions-Black Hills, dated 1877. To better read the finer print, click on the image and select the desired size from the menu at the top of the page. The map plate carries the following message:
This is the only Map of the Black Hills ever compiled from actual survey. The survey was made at the expense of much time and money, by Major George Henckel, Deputy United States Surveyor, and its correctness is acknowledged by many reliable parties who have personal knowledge of the Black Hills Country.
Gen. Wm. P. Dewey, U.S. Surveyor General says: “Mr. George Henckel, who is a surveyor, and otherwise competent man, is recently from the Black Hills, Dakota, where he has spent the past season, engineering and surveying in the mining districts, and has thereby and therein collected much valuable and reliable information regarding that new and rich country. He has at much expense and labor executed a map of the Black Hills Country, and the principal mining districts therein, and I have carefully examined his map, and pronounce it a most excellent exhibition of the geography of the Black Hills and mining country…. He holds the appointment of U.S. Deputy Surveyor under me.”
WM. P. DEWEY, U.S. Surveyor General