This subset of the metadata from the David Rumsey Map Collection was created for the collaboration between David Rumsey and Machines Reading Maps. luna_omo_metadata_56628_20220724.zip contains metadata sourced from both Luna Imaging and Old Maps Online on 24 July 2022 for all georeferenced maps in the David Rumsey Map Collection (~57k records). normalized_luna_omo_metadata_20230405.zip contains a more user friendly version of the same metadata, unpacking some of the nested fields in the previous file. Please consult the README for details about the transformations used for the normalized file.