The tarot : its occult signification, use in fortune-telling, and method of play, etc. / by S.L. MacGregor Mathers. (OCLC #4237056)
Some authors are most often published using initials for their first or middle names. While it is important to retain this form in the authorized access point, its brevity can cause more collisions (multiple authors having the same authorized form). For this reason, a fuller form (with the abbreviated name spelled out) may also be included in the authorized access point, like:
100 1_ ǂa Mathers, S. L. MacGregor ǂq (Samuel Liddell MacGregor), ǂd 1854-1918.
In a MARC authority record, the fuller form is also recorded in 378:
378 __ ǂq Samuel Liddell MacGregor