John A. Beck numismatics correspondence, c. 1900-1920, scanned from photocopies of originals in the Carnegie Museum of Natural History. Courtesy of Wayne K. Homren.
Correspondents include Adams & Company, Edgar H. Adams, Ulric(?) Allen, American Numismatic Association (Frank Duffield), George H. Blake, A. J. Brady, Van Schaik & Brice, C. F. Clarke & Co., J.S. Canddario(?), S. H. and H. Chapman, Byrle Davis, Robert Woolley (U.S. Mint Director), Divver & Co., Thomas Elder, Alvin J. Fink, A. C. Gies (Western Pennsylvania Numismatic Society), H. O. Granberg, Ludger Gravel, W. F. Greany, Ben G. Green, J. M. Henderson, William Hesslein, J. Lehrenkrauss & Sons, Theophile E. Leon (Chicago Coin Company), A. Atlas Leve, Edward E. Levi, Lyman H. Low, E. W. Jeffrey, C. Johnson, Nathan Joseph, J. E. Inman, S. D. Kiger, Jun Kobayagawa Co., H. O. Mann, Fred Michael & Bro., B. Max Mehl. The Mehl correspondence is extensive.