Bestselling author Douglas Preston is continuing his war of words with Amazon. After writing a letter to readers calling on them to ask the e-tailer to end its sales terms dispute with Hachette, Preston posted an updated version of the note, complete with the signatures he has collected from other authors.

Preston has been collecting signatures for the past few weeks and the updated letter will go out to readers explaining his, and the signees, take that the Amazon-Hachette dispute puts authors in the middle. Preston is also planning to take out a full-page ad in The New York Times that features the final, signed letter.

In an accompanying note to authors asking them to sign, Preston makes clear that "this is a totally independent effort." He continues: "No organization, company, or publishing house is sponsoring us."

To date, several hundred writers have added their names, many of whom are not even published by the Hachette Book Group (as Preston is). According to Preston, another 200 names will be added to the list soon.