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 (feb. 2021), 139–156. DOI:https://doi.org/10.7203/sjp.23.2.20402.