Minecraft wiki entry for 1.2, associated text: Java Edition Alpha v1.2.0-preview
Java Edition Alpha v1.2.0
Java Edition Alpha v1.2.0_01
Java Edition Alpha v1.2.0_02
Java Edition Alpha v1.2.1
Java Edition Alpha v1.2.1_01
Java Edition Alpha v1.2.2a
Java Edition Alpha v1.2.2b
Java Edition Alpha v1.2.3
Java Edition Alpha v1.2.3_01
Java Edition Alpha v1.2.3_02
Java Edition Alpha v1.2.3_04
Java Edition Alpha v1.2.3_05
Java Edition Alpha v1.2.4_01
Java Edition Alpha v1.2.5
Java Edition Alpha v1.2.6