John Buchtel, formerly of Georgetown University found for us the single they own. To date we have identified approximately 40 libraries that have 1-3 sueltas in their collection and sometimes these are quite interesting. We are counting these as well; we would like our census to be complete.
We hope that proving that every single suelta they own is added to the database, making the aggregate ever larger, will encourage you to search your institution’s OPAC in search of these imprints.