The following volumes of International Astronomical Union Colloquium are currently missing from the archive, and are in the process of being produced: Volumes i, ii, v, vi, vii, ix, xii, xiii, xv & xx.  

We are currently trying to source the following volumes of International Astronomical Union Colloquium. If you can help with supplying these volumes, please contact Natalie Liddell: Volumes xi, xiv, xvi, xvii, 16, 20 & 55.  

Volumes 34, 65, 118, 119 & 168 of International Astronomical Union Colloquium were never published.

We do not have permission, or are currently seeking permission to publish any volumes missing from the Colloquium, Symposium and Transactions archives.