Updated per information received from Dave Fox: piccolo/flute and oboe/EH books are not numbered; baritone saxophone requires low A and bass clarinet is scored to low D.
Updated per information received from Dave Fox: flute book also requires alto recorder, “but it is only about four measures and they can easily be played on flute.”
The alto recorder does play a bit more than four bars and the part is quite soloistic and characteristic; but as it starts on a high E and goes down to a D, I play it on soprano as it lays better. (I also added the recorder to the Scarecrow motif at the end when the Wizard is giving them their medals)
Updated per information received from Rick Kissinger
Updated per information received from Dave Fox: piccolo/flute and oboe/EH books are not numbered; baritone saxophone requires low A and bass clarinet is scored to low D.
Updated per information received from Dave Fox: flute book also requires alto recorder, “but it is only about four measures and they can easily be played on flute.”
The alto recorder does play a bit more than four bars
and the part is quite soloistic and characteristic; but as it starts on a high E and goes down to a D, I play it on soprano as it lays better. (I also added the recorder to the Scarecrow motif at the end when the Wizard is giving them their medals) 
Reed 1 is mostly bass clarinet with little alto sax.
Reed 3 is mostly baritone sax.
Reed 2 may be the most challenging, requiring strong skills on both flute and clarinet. The sax parts in all 3 doubling books are not difficult.