@book{mayall_2015_8326, author = {Mayall, R. Newton and Mayall, Margaret W.}, title = {{The Harold C. Ernst Collection of Portable Sundials}}, publisher = {Zenodo}, year = 2015, month = feb, doi = {10.5281/zenodo.8326}, url = {https://doi.org/10.5281/zenodo.8326} }