Electional Astrology
Vivian Erwood Robson lived from 1890 to 1942.  By trade he was a librarian.  Like many librarians he had a natural bent for research, and, in his particular case, astrology.  He studied ancient astrologers closely, including Ptolemy, William Ramesey & William Lilly.  His books on electional astrology, fixed stars, and relationships, are 20th century classics.