The Library of Congress Name Authority File record for Crabb, John H., 1922- identifies two of his works as In the crescent's dark shadow (1952) and The legal system of Congo-Kinshasa (1970).
The latter of these works has been digitized at the Internet Archive.
On the title page, John H. Crabb is identified as Professor of Law, Georgetown University.
In the preface, written by the author, he explains that he was a visiting professor at Lovanium University at Kinshasa from 1964 to 1966.
A 1959 publication on the history of the law school at the University of North Dakota contains a portrait photo of John H. Crabb, probably taken around 1957, when he joined the UND Law faculty. This same publication states that Crabb was a graduate of the University of Michigan.
In 1978, John H. Crabb was teaching in Paris.
In the fall semester of 1958, John Crabb was a Fulbright Scholar to Guatemala.
A 1964 article by John H. Crabb provides the dates of his degrees: A.B., 1943, Michigan; M.A., 1954, Detroit; LL.B., 1948, Harvard Law.
The 1943 University of Michigan Proceedings gives the full name of the 1943 graduate as John Holland Crabb.
A 1942 draft card for John Holland Crabb from Michigan gives his birthdate as August 7, 1922.
A French database of 2004 deaths contains a listing for the death of an American, John Crabb, born 19220807 (in ISO 8601 format), died 20040620.
The Ancestry transcription of the encoded death list gives his place of death as Saint-Julien-En-Genevois, Haute-Savoie, France.