Java Edition 13w39a

13w39a is the eighth snapshot released for 1.7.2.

This version has been removed from the launcher for quite a bit, then it was added back in September 2018.

Additions

 * Added red sand
 * Generated on the lowest surface levels of the mesa biome
 * Behaves like normal sand
 * Can be smelted into glass and crafted into TNT, but cannot be crafted into sandstone
 * Added minecart with command block
 * Can only be obtained using, or
 * Activated by activator rails
 * Run their command every so often as long as they are powered - Running a command block minecart across a single powered activator rail at full speed will run its command thrice
 * Can be success-tested while on a detector rail with a redstone comparator next to the rail (just like how the minecart with chest and minecart with hopper can be fill-checked)

Changes

 * Orange stained clay generates in mesa in place of sandstone
 * When enchanting books, books can now gain multiple enchantments.
 * Logging is now done using Log4j 2
 * Default logging location is now in logs/latest.logs, older logs are archived in logs/2013-09-23-1.lg.gz, with the number at the end increasing each startup
 * Thanks to Log4j 2, the way logs are saved can be changed, examples: html page, database, errors only, no logging at all