Upon recommendation from my friend Richard Horrell at WW2Connections, I placed an order from Alibris Books for:
Shoulder Sleeve Insignia of the US Armed Forces 1941-1945
by Richard W. Smith
The edition has 251 pages, with 32 color plates. Format is 81/2 in. wide by 11 in. tall.
Since I not only conduct research for myself, but for others now too, I know this will become an indispensable book in my library. 
You can find copies through using these ISBN's:
Hardback ISBN 0-9618883-2-6
Paperback ISBN 0-9618883-3-4
Marion J Chard
Proud Daughter of Walter 'Monday' Poniedzialek
540th Combat Engineer - H&S Company
I'm looking for a good deal on a book about DUI pins. I've seen a set that is printed by volume for Infantry, Artillery and support, etc. I just haven't found a good deal.
Steve
Enginears...Engeneres....Engineres----- I are one and I can't spell it.