Aoi Nishimata Illustrations Nocturne was the second doujinshi art book Nishimata released via her circle Joker Type for Comiket 72. Up until the release of her commercial art book, VIVID, this was really the most recent collection of Nishimata's illustrations. There have been other commercial productions, but none that were all illustrations.
H2SO4's Tropical Nights doujinshi is a B5 sized collection of color and monochrome art works. And unlike H2SO4's Shiroi Hanabira, there are no guest art works in this one. The illustration above is also the cover illustration, and it's good that it gets re-printed inside since the cover of this glue-bound volume has a shimmering, metallic finish.