From a tracing of the Charles Preuss drawing of 1844.

From a tracing of the recent photograph.

Peak 9007' can only be seen from this exact location.

Did Charles Preuss make use of the camera obscura in his drawings?

San Marino, CA January 14, 1999. I have never seen such a remarkable convergence as of your photos and Preuss's sketches of the expedition campsite. Congratulations. Andrew Rolle, John Charles Frémont; Character as Destiny, University of Okalahoma Press, 1991.