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J E F F E R S O N LAKE SULPHUR
COMPANY
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CALLÈRY CHEMICAL COMPANY
LEONARD REFINERIES INC.
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HANCOCK CSIEHICAI. (VIMPANÏ
AMERICAN OIL COMPANY
Co., Inc.
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PARSONS
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THE RALPH M . PARSONS
Ν EW Y O R K PASADENA WASH I N G T O N
COMPANY
ANKARA BAGHDAD BEIRUT J EDDAH KARACHI NEW DELHI PARIS
ENGINEERS» CONSTRUCTORS LOS ANGELES For further information, circle number 49 A on Readers' Service
Card, page 115 A VOL. 4 9 , N O . 5
·
MAY
1957
49
A