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NAVTECH  
US SURVEYORS ASSOCIATION
1-800-245-4425
Robert P. Sefiwowicz, MMS
5725 Keowood Ave.
Harrisburg PA  17112
(717)541-8223
Herbert N. Wood, MMS
60 Willits Way
Glen Mills PA 19342
(609) 845-3847
Capt. Peter F. DelRossi, MMS
7049 Rutland Street
Philadelphia, PA. 19149
(215) 745-1965(office)
(215) 745-3567(fax)
(609) 447-3341(summer)
Ralph Dinapoli
2051 Wharton Rd.
Glenside, PA 19038