Reproduced with permission of the American Philosophical Society: Docs. 42, 46-47, 49. Reproduced with permission of the AT&T Corporate Archive: illustration on p. 68 (neg. 2751). Reproduced with permission of the Thomas A. Edison Papers, Rare Book and Manuscript Library, Columbia University: Docs. 130, 164, 273. Reproduced with permission of Dun & Bradstreet and the Baker Library, Harvard University: Docs. 252, 254, 260, 265-66. From the collections of the Henry Ford Museum and Greenfield Village: Docs. 3-5, 25, 43 (negs. B99238, B99239), 51-53, 56, 60, 76 (negs. B99252, B99253), 82, 87, 95, 97 (neg. 99172), 99-100, 129, 158 (negs. B99248, B99249, B99250), 178, 195 (negs. B99244, B99245, B99247), 249 (negs. B99232, B99233), 255 (negs. B99230, B99231), 289 (negs. B99234, B99235), 290 (neg. B99241); frontispiece (neg. B37330); illustrations on pp. 6 bottom (neg. B99173), 55 (neg. ECP-95), 85 (neg. B99259), 133 (neg. B99258), 154 bottom (neg. B101407), 161 (neg. B99170), 171 right (neg. B99243), 232 (neg. B99246), 346 (neg. B99251), 372 bottom (neg. B99256), 385 (neg. 13318), 463 top (neg. B99171), 584 (neg. B99236). From the collection of Charles Hummel: Doc. 199. Courtesy of Dr. Charles F. Kempf: illustration on p. 7. Courtesy of Newark Public Library: illustration on p. 363. Courtesy of the New York Historical Society: Docs. 144, 148, 168, 185, 204, 261. Reproduced courtesy of Post Office Archives, London: Docs. 146, 318-19; illustration on p. 186 (ATF). Reproduced with permission of Dorothy C. Serrell: illustration on p. 196.

Courtesy of Edison National Historic Site (all designations are to TAEM reel:frame unless otherwise indicated): illustrations on pp. 5, 6 top, 27, 76 (12:14), 103, 126 bottom (Cat. 551:3), 130 (Cat. 551:5), 154 top (Cat. 551:2, 47), 209 (Cat. 551:8), 210 (Cat. 551:23), 211 (Cat. 551:50), 217 (27:169), 219 (27:201), 272 (27:169), 274 (5:399), 303, 347 top (96:572), 347 bottom (27:136), 369 (5:456, 591), 372 top (5:164), 373 (Cat. 551:19, 41), 379 (27:136), 402 (Cat. 551:15), 436 (27:168, 174), 437 (27:168), 462 (5:345), 473, 488 (96:570), 514 (27:136), 563 left (5:809), 592 (6:906), 600 (6:899).