No Favourites, every catalogue, manuscript, bulletin, monograph, has equal importance.
Men and women, specialists in their field, offer up their life's work,
in print form for us to appreciate, often, at the simple cost of a hearty meal.
A good library, is a Joy.
I am privileged to have around 1000 catalogues, a large amount, donated by members here on SCF. 200 catalogues cover just Australia
Most used may be "Fritz Billigs" (that will set you back circa $1000)
50 odd volumes that cover the world, with information, not seen in a lot of popular catalogues.
Example : Canada