De Morgan, A., Thom, A., & Thom, S. (1851). The book of almanacs: With an index of reference, by which the almanac may be found for every year, whether in old stle or new, from any epoch, ancient or modern, up to A. D. 2000. With means for finding the day of any new or full moon from B. C. 2000 to A. D. 2000. Taylor, Walton, and Maberly.

De Morgan, Augustus, et al. The Book of Almanacs: With an Index of Reference, by Which the Almanac May Be Found for Every Year, Whether in Old Stle or New, from Any Epoch, Ancient or Modern, Up to A. D. 2000. With Means for Finding the Day of Any New or Full Moon from B. C. 2000 to A. D. 2000. Taylor, Walton, and Maberly, 1851.