The T-Junction.zip file you have requested: Maps Levels Missions / Campaign Maps / Left 4 Dead T-Junction Map - 6.18mb is not available. Perhaps try browsing all files for the game Left 4 Dead and upload any files you want to share or are missing. This is the only information we could locate:
New fully working first level in need of any feedback before campaign continues. Rebuilt nav file and tested coop with others. This is a small map and simply requires you to get from A to B. My first few weeks learning the beta tools and Hammer in general.