Nassau County (N.Y.) Pediatric Postgraduate Lecture Series 1971-1972: Weekly lectures are sponsored by the Nassau County Medical Center for practicing pediatricians on Long Island each Thursday at 11:30 A.M. in the Recreation Activities Building on the Medical Center Grounds. American Academy of General Practice credit has been applied for; there is no registration fee. Further information and a complete program are available from P. J. Collipp, M.D., Department of Pediatrics, Nassau County Medical Center, 2201 Hempstead Turnpike, East Meadow, L.I., New York 11554.