@misc{indiciaeb21d036f6e28,
  title = {United States Exploring Expedition. During the year 1838, 1839, 1840, 1841, 1842 / Botany. Cryptogamia. Filices, including Lycopodiaceae and Hydropterides — Illustration, Filices. PL. 42},
  year = {1854},
  url = {https://www.biodiversitylibrary.org/page/43553709},
  note = {Source identifier: page-43553709}
}