i had questions about this PDF so i figure i help the next person who's considering this purchase:
this is a compilation of all the mechs that were available from the Succession Wars down to Star League, there are some Variants that are available for Clan Invasion and Jihad in this, so if you want more advanced tech there you go.
these are all canon design mechs, however! if you have year specific TROs and/or Record Sheets, still hang on to those because the Late Succession War era isn't present in this PDF. i'm reffering to the 3050 TRO and Record Sheet, even though it's entering Clan Invasion, there was a brief time of a renaissance which some Lost Tech was rediscovered.
overall, i highly recommend getting this, all of the mechs record sheets in a 200+ PDF that you can print out your Lance or a specific Mech, and you're ready to go.