Wagner, R. H. (2021). Laveineopteris polymorpha FROM THE lower Westphalian (Langsettian) “fern ledges” at Saint John, new brunswick, Canada, and comparison with Laveineopteris hollandica from Europe. Spanish Journal of Palaeontology, 23(2), 139–156. https://doi.org/10.7203/sjp.23.2.20402