There are several books about Lemko pysanky, and most books about pysanky discuss or illustrate Lemko eggs as well.  The best book on the subject is Markovych’s «Українські Писанки Східної Словаччини»  (Ukrainian Pysanky of Eastern Slovakia), which was published in 1972.  An updated English language version came out in 1987, but many of the pysanky in it are modern and the publisher had a political agenda.

Three more recent books I found of particular interest are these about Lemko pysanky:

Липовянські Писанки: a book with lots of photos of drop-pull pysanky from Lypovyany, a Lemko enclave in Croatia.  It is bilingual, in Ukrainian and Croat, and was originally published in Zagreb.

Лемківська Писанка: a larger book, in Ukrainian, about Lemko pysanky, and with photos from a 2009 exhibit in Lviv.

Лемківська Писанка – Традиції та Сучасні Тенденції: another book, in Ukrainian, about Lemko pysanky, traditonal and modern.  It has lots of photos from a 2013 exhibit in Lviv.

Even if you can’t read the text, these books are worth downloading for the photos alone. Clicking on the title should allow you to download.