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[[large pencil X over page]] 1. The variable nebula NGC 2261. Astrophysical Journal, vol. 44, pp. 190-197, 1916. 2. The color of nebulous stars. (F. H. Seares and Edwin Hubble). Mount Wilson Contributions, No. 187, (15 p.) Astrophysical Journal, vol. 52, pp. 8-22, 1920. 3. A general study of diffuse Galactic nebulae. Mount Wilson Contributions, No. 241, (38 p.) Astrophysical Journal, vol. 56, pp. 162-189, 1922. 4. The source of luminosity in Galactic nebulosity. Mount Wilson Contributions, No. 250, (39 p.). Astrophysical Journal, vol. 56, pp. 400-438, 1922. 5. Cepheids in spiral nebulae. (Read at A.A.A.S. Washington Meeting 1925). Observatory, vol. 48, 1925. 6. NGC 6822, a remote stellar system. Mount Wilson Contributions, No. 304, (25 p.). Astrophysical Journal, vol. 62, 409-433, 1925. 7. A spiral nebula as a stellar system - Messier 33. Mount Wilson Contributions, No. 310, (39 p.). Astrophysical Journal, vol. 63, 236-274, 1926. 8. Extra-galactic nebulae. Mount Wilson Contributions, No. 324, (25 p.). Astrophysical Journal, vol. 64, 1926. [[/large pencil X over page]]