The Pennsylvania Academy of Sciences has published Volume 90, issue 1 of the Journal of the Pennsylvania Academy of Science containing the following research articles:
A CHECKLIST AND DISTRIBUTIONAL SYNTHESIS OF AMPHIBIAN AND REPTILE SPECIES IN COLUMBIA COUNTY, PENNSYLVANIA SEAN M. HARTZELL
THE USE OF A BRINE SHRIMP ASSAY TO DETECT BIOACTIVITY IN THE ENDOPHYTE-INFECTED GRASS, AGROSTIS HYEMALIS MATTHEW K. KOLBECK AND TAMMY E. TINTJER
RESEARCH NOTE: MULTIPLE PATERNITIES IN AMERICAN BLACK BEARS FROM NEW JERSEY TERESA A. OMBRELLO, NICOLE L. CHINNICI AND JANE E. HUFFMAN
RESEARCH NOTE: TICKS AND TICK-BORNE PATHOGENS OF BLACK BEARS (URSUS AMERICANUS) IN NEW JERSEY KACIE CHERN, MEAGHAN BIRD, AND KAITLYN FREY