The Foundations of Telephony, the Telephone and its Inventors / William Aitken. 1937. [Ts. vol., xi + 404p. This book is the unabridged typescript of Aitken's Who Invented the Telephone? published by Blackie & Son in 1939 (a copy of which is shelved at 621.395:93). See also inv. no. 1992-286 (MS 2069)]