Avocado: What kind is it?

Although I don't have any solid evidence, I believe that the avocado trees which I am growing are of the Hass variety. The skin was rough and pebbly and dark purple to black, so it seems like Hass is the variety that fits the bill.

There is more on avocado varieties here at avocado.org.

I haven't seen any other varieties except for Hass (or what I take to be Hass at any rate) here in Japan. Looking at all the different varieties is certainly interesting, but not quite as fun as tasting them. I wonder where I can get my hands on some non-Hass varieties.