Minecraft wiki entry for Development_versions, associated text: 1.6.1 snapshots 13w19a, 13w21a, 13w22a, 13w23a, 13w24a, 13w25a, 13w26a and the 1.6 pre-release
1.7.2 snapshots 13w36a, 13w37a, 13w38a, 13w39a, 13w41a, 13w42a and 13w43a, and 1.7.4 snapshot 13w47a
1.8 snapshots 14w02a, 14w03a, 14w04a, 14w05a, 14w06a, 14w08a, 14w10a, the 1.8 pre-release and the 1.8.2 pre-release
1.9 snapshot 16w04a
Release 1.10.
1.11 snapshots 16w40a, 16w41a, 16w43a, 16w44a and 1.11-pre1.
1.11.1 snapshot 16w50a.
1.12 snapshot 17w06a.
1.13 snapshot 17w50a.