From the artist's pixiv:
http://www.pixiv.net/member_illust.php?mode=medium&illust_id=44799892

This one was free, but the artist will be releasing a new book soon:
http://www.dlsite.com/maniax/announce/=/product_id/RJ162973.html
And here's his previous book:
http://www.dlsite.com/maniax/work/=/product_id/RJ161644.html

Ikuiku-con/Namida no Teinentaishoku is a group of artists who often release joint publications.
You can find most of their stuff here:
http://www.dlsite.com/maniax/circle/profile/=/maker_id/RG26160.html
(Copypaste the dlsite links manually if they redirect you to the home page)

Additionally, the're going to be releasing a bigger 52 page book, featuring this artist and a few others.
http://www.pixiv.net/member_illust.php?mode=medium&illust_id=52733287
Which should make its way to the digital store eventually.

They're pretty cool guys, so please support them if you can.

You sure this isn't an extended sample?

Base +8

@Zelinko
Yeah, I'm pretty sure it's the whole thing.
http://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_071578zero/

Base +13

(C80) [DA HOOTCH (Various)] Bestiary I

/g/469536/8090b2fd2d/

(C82) [DA HOOTCH (Various)] Bestiary II

/g/524348/1e991f1e38/

[DA HOOTCH (Various)] Bestiary 3

/g/856874/a450e1d965/

Base +4, Zakuzelo -9, Seelenmord -10, user00 -7