Michael Grant Contributions to Animorphs?

[sherrilina.livejournal.com]

This is a follow-up post to my previous one announcing Michael Grant's appearance at the National Book Festival in DC this upcoming Sunday. I know that he helped write the Animorphs series, but does anyone know if there's anything out there about which books he might have more specifically helped to write or create within the series? (I'm assuming all the KA ones only for starters). Same with Everworld.

I'm just trying to figure out which ones to bring for him to sign....