{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}
{Charles L. Limes; E. M. Lindsay; Charles B. Lipman; Charles G. Little; L. C. Lonyo; Rafael Obregon Loria; Los Angeles Board of Park Commissioners; Los Angeles Civic Bureau of Music and Art; Los Angeles Times [G. L. Goodmansen]; Hazel Marie Losh; Katheryn Lowe [incl ltr Irving M. Grey ? FHS]; Percival Lowell; Robert L. Lucas; --Luppo-Cramer; Lwow Astronomical Institute}
{incl "Full-Tone Collotype for Scientific Reproduction," Supplements 6-13; reprint of "Photographic Studies of Nebulae," by John Charles Duncan w/ samples of photo collotype}