The  Coast Defense Study Group was so kind as to share their collection of FMs with us. There are exceptionally good scans, not OCRed yet, but in most cases with great details allowing for a much better analysis of the images. If you find the time, pay them a visit, their website is amazing and the history of fotrifications in the US is undervalued to say the least. From their depository, we’ve added the FMs listed below today – Thank you again for this, CDSG!
This means that we now have 360 of the 527 FMs from the Second World War known to us, which gives us already a pretty good coverage. It looks even better for the prewar-FMs, where we have 48 out of 64, and the missing ones are with two exceptions updates or earlier versions of a manual we already uploaded.  Next up: The Cold War manuals. But first, here’s the list of updates:

FM 4-45 Coast Artillery Field Manual. Seacoast Artillery. Service of the Piece. 12 Inch gun, Railway Mound, M1918, Railway Artillery (1940).pdf
FM 4-5 Coast Artillery Field Manual. Seacoast Artillery Organization and Tactics (1940).pdf
FM 4-5 Coast Artillery Tactics (C1) 1944.pdf
FM 4-6 Coast Artillery Field Manual. Seacoast Artillery Tactics and Technique of Controlled Submarine Mines (1943).pdf
FM 4-7 Tactics and Technique of Controlled Submarine Mines, Ground (1945).pdf
FM 4-15 Coast Artillery Field Manual. Seacoast Artillery Fire Control and Position Finding (1943).pdf
FM 4-30 Service of Gun data Computer M1 (1943).pdf
FM 4-32 Service of Base End Data and Gun Data Transmission Systems (1944).pdf
FM 4-41 Coast Artillery Field Manual. Operation and Care of Railway Artillery Equipment (1943).pdf
FM 4-144 Antiaircraft Artillery Field Manual. Service of Radio Set SCR-584 (1943).pdf
FM 4-145 Coast Artillery Field Manual. Antiaircraft Artillery. Radio Set SCR-258 (1942).pdf
FM 4-48 Coast Artillery Field Manual. Service of the the Piece Seacoast Artillery 8-inch Gun, Mark VI, Modification 3A2, On Railway Mount M1A1 (1943).pdf
FM 4-49 Coast Artillery Field Manual. Service of the the Piece Seacoast Artillery 8-inch Gun, Mark VI, Modification 3A2, On Railway Mount M1A1 (1940(.pdf
FM 4-51 Coast Artillery Field Manual. Operation and Care of Railway Artillery Equipment (1943).pdf
FM 4-74 Service of the Piece–6-Inch Gun M1903A2 or M1905A2 on BC M3 and M4 (1944).pdf
FM 4-91 Coast Artillery Service of the Piece–90mm Gun M1 on 90mm Mount M3 (1943).pdf
FM 4-95 Seacoast Artillery Service of Radio Set SCR-296-A (1943(.pdf
FM 4-100 Antiaircraft Artillery Field Manual, Organization and Tactics of Antiaircraft Artillery (1943).pdf
FM 4-101 Antiaircraft Artillery Field Manual. Employment of Antiaircraft Artillery with Armored Forces (1943).pdf
FM 4-102 Employment of Antiaircraft Artillery Automatic Weapons (1943).pdf
FM 4-103 Antiaircraft Artillery Field Manual. Employment of Antiaircraft Artillery with Airborne Forces (1943).pdf
FM 4-106 Antiaircraft Artillery Field Manual. Employment of Antiaircraft Searchlights and the AAAIS (1943).pdf
FM 4-110 Coast Artillery Field Manual. Antiaircraft Artillery. Gunnery, Fire Control and Position Finding (1940).pdf
FM 4-112 Coast Artillery Field Manual. Antiaircraft Artillery. Gunnery, Fire Control and Position Finding, Automatic Weapons (1940).pdf
FM 4-121 Antiaircraft Artillery Field Manual. Fire Control, Guns (1943) guns.pdf
FM 4-135 Coast Artillery Field Manual. Antiaircraft Artillery. Marksmanship and Service of the Piece. Antiaircraft Machine Gun (1940).pdf
FM 4-136 Antiaircraft Artillery Field Manual. Service of Directors M4 and M7 (1943).pdf
FM 4-138 Antiaircraft Artillery Field Manual. Service of Directors M9 and M10 (1943).pdf
FM 4-140 Coast Artillery Field Manual. Antiaircraft Artillery. Service of the Piece. 37-mm Antiaircraft Gun (1941).pdf
FM 4-143 Antiaircraft Artillery Field Manual. Service of Height Finder SCR-547 (1943).pdf
FM 4-188 Antiaircraft Artillery Field Manual. Barrage Balloon. Service of the Balloon and Balloon Equipment, Very Low Altitude (1943).pdf
FM 4-196 Antiaircraft Artillery Field Manual. Barrage Balloon Rigging and Fabric Repair (1943).pdf
FM 4-146 Antiaircraft Artillery Field Manual. Service of Radio Set SCR-545 (1943).pdf
FM 4-150 Coast Artillery Field  Manual. Examination of Gunners (1940).pdf
FM 4-150 Coast Artillery Field Manual. Examination of Gunners (Change 1) (1940).pdf
FM 4-159 Antiaircraft Artillery Field Manual. Service of the Piece. Multiple Gun Motor Carriage M15 (1943).pdf
FM 4-160 Antiaircraft Artillery Field Manual. Service of the Piece. 40-mm Fire Unit (1943).pdf
FM 4-175 Antiaircraft Artillery Field Manual. Service of the Searchlight (1943).pdf
FM 4-176 Antiaircraft Artillery Field Manual. Service of Radio Set SCR-258 (1943).pdf
FM 4-187 Antiaircraft Artillery Field Manual. Barrage Balloon. Service of the Balloon and Balloon Equipment, Low Altitude (1943).pdf