I did a google search using these terms: to the young men only by boyd k packer
A .pdf version of the pamphlet was the 3rd hit. It is on a non-church sponsored site maintained by someone who self-reports as a member of the church.
The 4th hit on the search has the text of the pamphlet on a web page. This site also is not officially affiliated with the church.
Not sure if I should post the links here - but the document (or the text on a web page) is pretty easy to find.