Found a few more fairly recent pictures:
Agave vilmorriniana and Agave applanata 'Cream Spike', which interestingly appears to not be as happy in the ground as it was in a pot:
Agave x arizonica and Agave parryi var. truncata:
Agave chrysantha with Agave salmiana (back left) and Agave americana ssp. protoamericana (back right) and Agave guiengola:
