261
Published 2000
262
Published 2000
263
by Simrin, Steven.
Published 1989
264
by Carver, D. K.
Published 1985
265
by Shelly, Gary B.
Published 1972
266
by Kreitzberg, Charles B.
Published 1975
267
Published 1998
268
by Donovan, John J.
Published 1972
269
by Chirlian, Paul M.
Published 1981
270
by Sloan, M. E. (Martha E.)
Published 1980
271
by Santore, Ron.
Published 1980
272
by Boyet, Howard.
Published 1978
273
by Wulf, William A.
Published 1981
274
by Teorey, Toby J.
Published 1982
275
by Miastkowski, Stan.
Published 1983
276
by Tucker, Allen B.
Published 1982
277
by Mazlack, Lawrence J.
Published 1983
278
by Wakerly, John F.
Published 1981
279
by Gibson, Glenn A.
Published 1982
280
by Waite, Mitchell.
Published 1983