It can also be a magazine or a website where your work is included.
I too received a payment this time - my 2nd.

On Oct 18, 2019, at 1:11 PM, Linda Feltner <[log in to unmask]> wrote:

Hi Tricia:
Britt is correct. The name of the publication and its ISBN number, along with title of the illustration. Your illustration does not have to be registered individually with the copyright office. 
Minimum of three books.  
I listed six, and just received payment. 
Best wishes,
Linda M. Feltner Artist LLC
P.O. Box 325, Hereford, AZ 85615
On 10/18/19 12:50 PM, Griswold, Britt (GSFC-279.0)[LUSA Associates] wrote:
[log in to unmask]" style="font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;" class="">
I believe you just have to be able to site the publication number which should be registered with the copyright office. You do not have to have individually registered the artwork.
From: SciArt-L Discussion List-for Natural Science Illustration- <[log in to unmask]> on behalf of Tricia Cassady <[log in to unmask]>
Reply-To: SciArt-L Discussion List-for Natural Science Illustration- <[log in to unmask]>
Date: Thursday, October 17, 2019 at 5:27 PM
To: "[log in to unmask]" <[log in to unmask]>
Subject: [EXTERNAL] Re: [SCIART] Second ASCRL payout benefits GNSI members
Does one have to have the published artwork also filed with the copyright office in DC?
Thank you,
Tricia Cassady


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