Self-Propelled Howitzers Tanks Illustrated No.18 Arms & Armour Press ISBN 0-85368-765-X
US Mechanized Firepower Today Tanks Illustrated No.26 Arms & Armour Press ISBN 0-85368-732-3
The two books are some of the general type containing info on the M109.
I have featured them here as they include some interesting detail shots including turret interior.
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