I weigh in with engee (gasp), aga and lex.
Here's a comprehensive 140 page guide written by David Thatcher 2008/10
"Saving our prepositions: A guide for the perplexed"
EVERYONE should print off Part I: Word plus preposition, Tabulated Guide (pages 111 - 130)
as well as Part II (words, mostly verbs, not requiring a preposition) You will find "crave" in this list!!
An excellent resource
http://www.savingourprepositions.com/Download_files/Saving%20Our%20Prepositions.pdf