letter
love letter
http://id.loc.gov/authorities/subjects/sh85078536
https://en.wikipedia.org/wiki/Love_letter
https://www.wikidata.org/wiki/Q1056617
An expression of love in written form. However delivered, the letter may be anything from a short and simple message of love to a lengthy explanation of feelings.
PR1349.L8
PN6140.L7
PS673.L6-PS673.L7
HQ801.3-HQ801.5
love letters
love-letter