Vol. for 1920 reprinted from v. 6, no. 10 of the Proceedings of the National Academy of Sciences as National Research Council Reprint and circular series, no. 11.

Vols. for 1929-30 issued combined.

The 3d, and 5th annual meetings were devoted to discussion, there being no scientific papers presented; therefore these transactions were not printed but were mimeographed for limited distribution only.

1920-44. 1 v.

Vols. 38, no. 4-v. 43, no. 3 include: IGY bulletin, no. 1-62; vols. 43. no. 3-v.46, no. 2 include: IG bulletin, no. 62-96; v. 48-49, no. 2 include: IHD bulletin, no. 1-6.

The Transactions of the 2d (called Scientific papers), 4th, 6th-9th annual meetings were published as Bulletin of the National Research Council.