Keeper Trout has just release a FULL COLOUR version of his amazing book via his website in PDF format.
For enthusiasts of the Trichocereus genus, (which is now lumped with Echinopsis), this book is second to none. Having it now available in colour is also a huge treat as the printed version was only in black & white due to the cost of printing 450 or so pages in colour at the time.
The Trichocereus genus is quite a cloudy one and this book will certainly help many people make more sense of what plants they have and where they may have come from.
I suggest people who are interested download the colour version and remember to donate some money via Paypal if you like his work. What Trout suggests you donate is considerably less money than would cost you to buy a physical copy of the black and white version.
The web link is below:
Happy learning and ID'ing everyone!