In 1912, as part of an appeal to raise money for a new church, the Rev. Jānis Kvietiņš, then pastor of the First Lettish Baptist Church of Philadelphia, wrote a 16-page pamphlet on the history of the Latvians titled Who are the Letts?: A short historical sketch of the Letts and the First Baptist Church of Philadelphia.
A photographic postcard featuring 71 members of the Philadelphia Latvian Baptist Youth Society, plus the Rev. Peter Buschman (Pēteris Bušmanis), 1916.