I put together a visual checklist for the 1909-11 T212 Obak Los Angeles Angels. Collecting one card per player in the set now translates to a single card per column, 27 in all. There are also some fun observations from laying the cards out this way.

The uniforms change each year. White in 1909, gray in 1910, and navy blue for 1911 newcomers.

The trippy streak backgrounds appear only in 1911. Not sure if this holds for other teams as well, but could signal the hiring of a new (and awesome!) artist.

This layout is helpful in knowing which players only have cards in the much tougher 1909 series. Luckily for me, there is only one Angel in this category.

Finally, as is well known to Obak collectors already, the layout affirms the use of repeated artwork for players common to the 1910 and 1911 issues, provided they stayed on the same team.
At the moment, I have 19 players and a good lead on a 20th. Has been a very fun pursuit, particularly for a kid from L.A.
Am also putting together one for my other hometown team, the Vernon Tigers. With 5 players in the 1909-only category, this will be a tougher one for me to collect.