Sorry that I have not digged into the mine to confirm whether these typos have been mentioned.
- page 196, the 14th line from the bottom:
"An object can be saved in a tree if a ROOT dictionary for it class has been generated…"
where “it class” should be “its class”.
- page 197, the 8th line from the top:
"… or it can be a set to a number between 1 and 99 indicating …"
where the “a” before “set” should be deleted.