What were the filming dates for the shows (we know that the air dates were Sept/Oct-May/June)?

That would be an interesting thing to have included on episode lists. On another thread about Tony Dow's appearance on CBS Sunday Morning yesterday, they had a brief shot of his collection of bound LITB scripts. The scripts probably show the production number and filming date.

As I said there, he ought to have those scripts scanned onto some website. It's an iconic show and everyone should be able to see the scripts.