On Sat, Sep 13, 2014 at 2:59 PM, Federico Leva (Nemo) <nemowiki@gmail.com> wrote:

Moreover, the Google ToS are very clear in forbidding any activity which
would result in you having a copy of their database/of the data the API
provides access to, IIRC even in form of a cache. However, you only want
ISBN? *If* you care about respecting your contract with Google, it may
be wise to directly ask them if they're ok with it.

Might be wise in any case: https://en.wikipedia.org/wiki/United_States_v._Aaron_Swartz

Running an automated process to access someone's computer in a way that they clearly don't allow is not a good idea.