Lessons Learned: The Iran-Iraq War by Stephen Pelletiere and Douglas Johnson, originally published by SSI in '91. An earlier draft version, published by the USMC as FMFRP 3-203, is available online at FAS.
A decent companion volume is Ronald Bergquist's The Role of Airpower in the Iran-Iraq War published right at the end of the war in '88. The link is to a pdf version, or you can get a hard copy through Amazon.
If you really want exhaustive detail, then try Cordesman and Wagner's 647 page The Lessons Of Modern War Volume II: The Iran-Iraq War
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