Many Things from the pamphlet assortment have records in LocatorPlus. Each of the pre-1801 and about 50,000 19th and twentieth century pamphlets don't but have records in LocatorPlus. Many of them can be found by seeking inside the Index-Catalogue of the Library with the Surgeon-General’s Place of work The Persons’s https://maps.app.goo.gl/4RRJnUstxVnoZ5sQ8