Dyfyniad APA

(1991). Modification to federal facility agreement (FFA), CERCLA section 120, former Weldon Spring Ordnance Works, 19 July 1991.

Dyfyniad Arddull Chicago

Modification to Federal Facility Agreement (FFA), CERCLA Section 120, Former Weldon Spring Ordnance Works, 19 July 1991. 1991.

Dyfyniad MLA

Modification to Federal Facility Agreement (FFA), CERCLA Section 120, Former Weldon Spring Ordnance Works, 19 July 1991. 1991.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.