You already know it's up to you. So, here's what coincollector.org thinks:
http://coincollector.org/coincollecting20cent.html (No)
Coin Link:
http://www.coinlink.com/CoinGuide/us-type-coins/ (No)
PCGS:
http://www.pcgs.com/setregistry/SetComposition.aspx?c=215 (major types, No)
http://www.pcgs.com/setregistry/SetComposition.aspx?c=155 (with type
variations, No)
I do not know if albums allocate a space for it.
It would appear as if mint mark placement doesn't count. Would I include
both in mine? You betcha'.
Thanks! You from Alaska by chance? ; >)
A long time midwesterner transplanted to Washington state. Still miss those
corn fields.
I know of no type album that calls for a second walking half or any other
mintmark migration.
The 1969 edition of the Library of Coins type album, though, calls for three
wheat ear Lincolns in terms of designer's initials: 1909 VDB, 1909-1917
without VDB, and 1918-1958 VDB on truncation.
James the Typist