#1 Clabon Walter (Cla) Allen FRAS, (28 December 1904 – 11 December 1987) was an Australian astronomer, director of the University of London Observatory and author of Astrophysical Quantities. Also author of Hiking from Early Canberra.
#2 C. W. Allen - Incorporate & and Grow Rich!
#3 C. W. Allen, fl. 1855 - Common Things