There has been some discussion here about Canada precancels. I love them. I made my own simple album using the standard catalog for organization. When I first started collecting Canada precancels I decided to ignore the doubles and other multiples - and just collect the normal and invert varieties. I am very happy with this decision. The multiples are almost all high-priced and even a fine collection looks sparse when they are included.
The Robert A Lee album  is quite nice, but because it includes all the multiple varieties, I decided not to use it. On this example page, I do not own the Brandon 1-MR4-I [cataloging 150$]. Also you can see where I have added the die-2 1-cent variety [1-105d] that was added to the latest 6th ed of the catalog. I didn't have the 1-cent and 3-cent die varieties on my original layout.http://home.roadrunner.com/~adrion/brandon.jpg