A Guide for the Church Usher Book

This seems to be pretty much all we have on crucifixion in antiquity, all in one 90 page book.
It assumes some knowledge of terms and Hx and there is a fair bit of Greek text (pretty much all translated though). There are also very good notes.
It isn't a manual for a legion's crucifixion squad, it's not a "how to" book...it is a look at how crucifixion was used and when it was used, a look at the documented sources, the social significance of it, lastly why this form of execution was in some ways a stumbling block for the adoption of early christianity.
It covers Roman use obviously, but also the use by many others (though in some areas this is sparsely covered due to limited sources): Persians, Indians, Celts, Britons, Carthaginians, Assyrians. Looks at mass crucifixions briefly too (Crassus and Alexander were fairly fond of it).
It places "the crucifixion" in it's cultural context and exposes the cultural baggage (and the humiliation and debasement) that comes with this type of judicial death.