{Earnest Charles Watson; W. Marshall Watts; H. A. Weersma; Mrs. F. E. Weyerhauser; Mel Wharton; John Wheldon & Co.; Wheldon & Wesley, Ltd; Fred L. Whipple; James T. White & Co.; Gordon Whitnall; J. H. Whitney; Walter T. Whitney; "Who's Who" [A. N. Marquis; Europa Publications, Ltd.]; Gustave P. Wiksell; Marian Wilder}
{The Neuner Co.; New Hampshire, University of [George N. Bauer]; News Chronicle [Robert Waithman]; Newton & Co., Ltd. [A. J. Batchelor]; New York Public Library [R. J. Lingel]; New York State Library [Gladys T. Jones]; Mrs. Wanda Sheldon Nichols; Seth Barnes Nicholson; A. A. Nijland}
{Albert Chase McArthur; Macbeth Daylighting Co., Inc. [Norman Macbeth]; Lucena McBride; Phoebe Merl McClees [ltrs M. E. Churchill ?? FHS; FHS ? Fisk Teachers' Agencies]; Frank McCoy; E. C. MacDowell; Anita Newcomb McGee; McGill University; Dean B. McLaughlin; MacMillan Co. Publishers [Rose Levy]; Mrs. John McMillan; Maud W. Makemson; E. Mallinckrodt, Jr.; Marburg University Library; Marchaut Calculating Machine Co. [folded]; W. L. Marcy; Marina, Instituto y Observatorio de; Marquis, A. N. & Co.}
{C. Addison Willis; H. C. Willis; Carl Wilson; Herbert C. Wilson; H. W. Wilson Co.; Latimer J. Wilson; Olin C. Wilson; Ralph E. Wilson; Clyde Wolfe; Coral Wolfe; Harry O. Wood; R. W. Wood; R. v. d. R. Woolley; J. H. Worthington}
{Edna Wadsworth; Heint Walentowsky; Gilbert T. Walker [folded]; O. R. Walkey; War Department [T. L. Coles; F. W. Coe]; J. G. Ward; Warner & Swasey Co.; Wasco County Library [Nina M. Moran]; Washburn College [Helen Whitaker]; Washburn Observatory [George C. Comstock]; Washington Academy of Sciences [Robert B. Sosman]; Washington, State College of [W. W. Foote]}
{John L. Ridgway; A. E. Riemer; T. K. Riggen; Philip S. Riggs; Augusto Righi; William E. Ritter; G. B. Rizzo; W. F. Roberts Co., Inc. [B. H. Roberts. folded]; H. P. Robertson}
{R. A. Millikan; Monroe Calculating Machine Co. [folded. incl Calculator Equipment Corp.]; Montevideo, Observatory of the University of [folded]; Monthly Weather Review; Joseph Monti; K. Moór [?]; Ernest C. Moore; Morava Construction Co.; D. W. Morehouse [incl ltr H. Shapley ? DWM]; D. P. Moreton; G. W. Morey; --Moriceau; T. H. Morgan; Sylvanus G. Morley; W. D. Morrison; Albert G. Mowbray [incl memo EPH ? FHS]; F. R. Moulton; Z. Müller; Carlos S. Mundt}
