Scanned historical occurrence notecards. Dates, locations, occurrence stages and any water quality or environmental indicators were extracted from narrative statements and are included in the described dataset.

  Part of: Garretson A, Napoli M, Feldsine N, Adler-Colvin P, Long E (2020) Vernal pool amphibian breeding ecology monitoring from 1931 to present: A harmonised historical and ongoing observational ecology dataset. Biodiversity Data Journal 8: e50121.