Neal Adams could use a little help -- well, a lot of help: The artist renowned for his work on such titles as Batman and Green Lantern/Green Arrow accidentally left two portfolios of original art in a New York City taxi, and he's trying to get them back.

The New York Post reports the books were in a beige Bucky O'Hare bag left in the trunk of a yellow cab on Sept. 4. His daughter Kris Adams places their value at tens of thousands of dollars.

Adams' studio is working closely with the Taxi and Limousine Commission and the New York Police Department to recover the portfolios. To that end, they're distributing fliers with a sketch of the cab driver by Adams, and an image of the bag (below). They've also provided images of the art.

Anyone who has the portfolio, or knows their whereabouts, is asked to call 212.869.4170. A reward is being offered.