They even have a resemblance. Hirsch and Mahler admired each other and this resulted in a series of impressive etchings specially made for the Mahler Lieder.
This series of etchings was published in a special portfolio in the series AUS WORPSWEDE 9. Nothing fancy , but important and together with the text of the songs these etching make a very strong artistic impression. The portfolio contains 8 songtexts together with 8 etching by Hirsch and is available at www.ftn-books.