Old Brass Identification

[cobra81]

Bought a bunch of brass at an old gentleman's estate sale. In a Folger's coffee can were a lot of old miiltary 30/06 shell casings. Some headstamps I have never seen; can anyone help me identify the following:
FA 33
EW 43
TW 43
SL 55

I assume the TW is for Twin Cities, and the SL for Salt Lake, but what about the FA and EW? Thanks!

 

[bigbird34]

H.S.

Franford Arsenal.....Philly Pa,EW, Eau Claire Ordnance Plant, Eau Claire, Wisc....BB34

 

[Chief-7700]

http://cartridgecollectors.org/headstampcodes.htm

The above site will tell you all about headstamps.
Chief-7700

 

[50 shooter]

SL was for the St. Louis Ord. plant.

 

[cobra81]

Cool. The brass is in pretty good shape for its age. (Unlike me).