marc-034 parses one or more MARC 034 strings and emit a (S, W, N, E) bounding box for each.

marc-034-convert is a command line tool to process one or more CSV files containing MARC 034 data and append bounding box information to a new CSV document.

marc-034d is a web application for converting MARC 034 strings in to bounding boxes (formatted as GeoJSON).