The first of what promises to be this year's flood crop of books about the A F's mischief makers. Shapiro, student of legends old and new, believes in them, and a new folklore in the making. This book is his contribution, the story of Oggins, who was from Missouri and had to be shown -- and who learned through every risk of flight and combat. He was unpopular because of his attitude, and it took a crash on German soil when all types of Gremlins confronted him, answered his questions and stilled his doubts, before he accepted their existence, their use and the necessity of cooperation. Gremlin tales have caught the public fancy. There may be too many of these books, but the first out will have the best break until THE Gremlin book (written by one of them?) comes along. The Donald McKay sketches are in the spirit of the text.