Steven J. Zaloga 
M7 Priest 105mm Howitzer Motor Carriage [PDF ebook] 

Based upon the ubiquitous Grant/Sherman tank, the M7 Priest is the iconic Allied self-propelled howitzer. It was the most widely manufactured vehicle of its type in World War ll and was utilized by the US, British, Canadian and Free French forces. Its combat debut was with Montgomery’s Eight Army at El Alamein and it fought subsequently in every major campaign through Sicily, Italy, Normandy and the final battles in Germany. In addition to covering all variants of the Priest, this book also looks at the major derivatives, including the British/Canadian Sexton and the US M12 155mm GMC.