tTj 
0 
~TJ 
 
 
0 
Oystershell: 
 
 Bay Dredging & Construction Co...... 
 
 Benton & Company, Inc 
 
 Fort Myers Shell & Dredging Co - - - 
 
 Houdaille-Duval Wright Co 
 
 Radcliff Materials, Inc 
Titanium concentrates: 
E. I. du Pont de Nemours & Co., Inc.. - - 
 
 Do                         Vermiculite, exfoliated: 
W.R.Grace&Co                  
 
 Do                          
 Do                         Verlite Co                        
 
Zirconium concentrates: 
E. I. du Pont de Nemours & Co., Inc - - 
 
National Lead Co                  
Lease No. 2233, dredge Hilisborough 
Lease No. 1788, dredge Pinellas__________ 
Lease No. 2235, dredge Lee_____________ 
White Shell, dredge Duval 
Lease No. 1718, dredge Walton 
Highland mine Clay 
Trail Ridge mine    do 
Boca Raton plant Palm Beach 
Jacksonville plant Duval 
Tampa plant Hillsborough 
 do 
Trail Ridge plant Clay 
Jacksonville plant Duval 
Box 1484 
 
Tampa, Fla. 33601 
 
Box 1347 
 
St. Petersburg, Fla. 33731 
 
Box 973 
 
Fort Myers, Fla. 33902 
 
Box 1588 
 
Jacksonville, F'la. 32201 
 
Mobile, Ala. 86601 
 
Du Pont Building 
 
Wilmington, Del. 19898 
 
  
 
62 Whittmore Ave. 
 
Cambridge, Mass. 02138 
 
Do. 
 
Do. 
 
Box 11385 
 
Tampa, Fla. 33610 
 
Du Pont Building 
 
Wilmington, Del. 19898 
 
Room 1900, 111 Broadway 
 
New York, N.Y. 10006 
Also staurolite and zirco,lium concentrates. 
Do. 
 
 
 
 
 
 
Also titanium and staurolite. Also rare-earth metal concentrates. 
 
' #~rU.S. GOVERNMENT PRINTING OFFICE: 1968 0—344-244/127.65