See the COVE Master Map entry on Gravesend: 

https://editions.covecollective.org/place/gravesend

In London Labour and the London Poor edition: 

Phase 1

A Visit to the Rookery of St. Giles and its Neighbourhood. (Volume 4): "There are among them sailors, whose largest voyage has been to Tothill Fields prison, or to Gravesend on a pleasure trip."

Phase 2

Of the Blind Street-sellers of Tailors’ Needles, etc. (Volume 1)

Statement of a Beggar. (Volume 1)

Of the Dredgers, or River Finders. (Volume 2)

Street Photography. (Volume 3)

The Coalbackers. (Volume 3)