To set forth the coming Islam storm. To better prepare the Crusades for TOTAL success.2) All inclusive medical bookTo instruct Europe of the necessary sanitary conditions, causes of the plague.
To set forth the concept, ideals, ideas of the Declaration of Independence/Constitution.
3) Doug Henning's Wonderful World of Magic OR the Joy of Cooking (I'll need a job). ;)
For number 1 (a), you’re too late.
By 742, the Muslims held North Africa, the Levant and Spain.
The main reason is that classical civilization collapsed (cf. Henri Pirenne’s work) was the rise of Islam.