Threads

4chan:
Reddit: 
 * http://chanarchive.org/4chan/x/41449/ umbra - first thread 
 * http://chanarchive.org/4chan/x/41532/umbra-radio-broadcasts - second 
 * http://chanarchive.org/4chan/x/41587/ umbra - third 
 *  (a fourth /x/ thread was lost before anyone archived it) 
 * http://chanarchive.org/4chan/x/42160 - fifth 
 * http://boards.4chan.org/x/res/9934818 - sixth  (404) 
 * http://boards.4chan.org/x/res/98831 (404) 
 * http://boards.4chan.org/x/res/9956975 -  (404) 
 * http://boards.4chan.org/x/res/9987598 -  (404) - http://chanarchive.org/4chan/x/44840/9987598
 * <span style="color:rgb(17,85,204);text-decoration:underline;white-space:pre-wrap;">http://boards.4chan.org/x/reshttp://boards.4chan.org/x/res/10016080/10016080 <span style="color:rgb(255,0,0);font-weight:bold;text-decoration:none;white-space:pre-wrap;">(404) 
 * <span style="color:rgb(17,85,204);text-decoration:underline;white-space:pre-wrap;">http://boards.4chan.org/x/res/10050779 <span style="color:rgb(255,0,0);font-weight:bold;text-decoration:none;white-space:pre-wrap;">(404) 
 * <span style="color:rgb(17,85,204);text-decoration:underline;white-space:pre-wrap;">http://boards.4chan.org/x/res/10053705 <span style="color:rgb(255,0,0);font-weight:bold;text-decoration:none;white-space:pre-wrap;">(404) 
 * http://boards.4chan.org/x/res/10073756

<p style="text-indent:36pt;margin-top:0pt;margin-bottom:0pt;"><span style="font-family:Arial;color:rgb(0,0,0);text-decoration:underline;white-space:pre-wrap;">Others: 
 * <span style="color:rgb(17,85,204);text-decoration:underline;white-space:pre-wrap;">http://www.reddit.com/r/conspiracy/comments/s3gek/encrypted_transmissions_found_online_currently/
 * <span style="color:rgb(17,85,204);text-decoration:underline;white-space:pre-wrap;">http://www.reddit.com/r/crypto/comments/s3m42/encrypted_transmissions_found_online_currently/
 * <span style="color:rgb(17,85,204);text-decoration:underline;white-space:pre-wrap;">http://www.reddit.com/r/codes/comments/sabev/umbra_cultrelated_ciphers/ 
 * <span style="color:rgb(17,85,204);text-decoration:underline;white-space:pre-wrap;">http://www.reddit.com/r/conspiracy/comments/s7sfv/umbra_transmission_13_up_xpost_from_crypto/
 * <span style="color:rgb(17,85,204);text-decoration:underline;white-space:pre-wrap;">http://www.reddit.com/r/codes/comments/sskcm/working_on_a_playfair_cipher_xpost_from_rcrypto/


 * <span style="color:rgb(17,85,204);text-decoration:underline;white-space:pre-wrap;">http://forums.unfiction.com/forums/viewtopic.php?p=936079
 * <span style="color:rgb(17,85,204);text-decoration:underline;white-space:pre-wrap;">http://forums.xkcd.com/viewtopic.php?f=3&t=83059