This is the first time I have registered photos with the eCO. I bought a very helpful book: "Photographer's Survival Manual--A Legal Guide for Artists in the Digital Age". However, I have one question remaining for which I can't seem to find the answer--
For unpublished works, is it acceptable to register works created in more than one year? For example, I would like to register photos that I created in 2010-2012. This comprises about 5000-6000 photos. Or, is it necessary to limit registration to photos created in a single calendar year?