I have reviewed every commit since the end of 2012. Here are the ones I consider to be problematic. I suggest that others have another review of these, as it may be that not everyone has taken the time to do this. - One zone for each inhabited ISO-3166 region should not have been removed: https://github.com/eggert/tz/commit/d3b025adb25554ee10b986850371e573df92733e... - Ensuing changes were wrong: https://github.com/eggert/tz/commit/df99923bde035a263493f3435db63db15df14d53 - Reversion did not revert everything, specifically the reverted links are still in the backward file, not the main file, indicating that they are deprecated which should not be the case (eg for Europe/Zagreb): https://github.com/eggert/tz/commit/ee40570d7d937de749fe89676dec2ff1526ee68b - Pre-1970 damage: https://github.com/eggert/tz/commit/5903db75e5974fbdede1fa05bcef53ff645ac13d https://github.com/eggert/tz/commit/9432f1d23d3c5bbcc14c26f781185c01679edeef - Montreal removal (looks like it changes pre-1970 history) https://github.com/eggert/tz/commit/45dcf69b45087cff50282d4da64b86a7d705ddf3 - Navajo - America/ShipRock removal https://github.com/eggert/tz/commit/d58b59dd8a1e4c10abdbab8857ae521f6c2d2536 https://github.com/eggert/tz/commit/81be53c16b97ce0bc561ce3891ce2503227e3369 - Other possibly dubious commits tzselect changes https://github.com/eggert/tz/commit/cc3f93886bcfe36dfedc8f340827fded6e43539c https://github.com/eggert/tz/commit/ebdf0c5d0ce06b20dcd7e984b7370548f74dc210 Not all of these cause damage, but some clearly do. I'm unhappy with most of them, as they break the principles I value. Stephen