Reddit mentions of Introduction to Vascular Ultrasonography: Expert Consult - Online and Print (Zwiebel, Introduction of Vascular Ultrasonography)

So here are my recommendations then.

https://www.amazon.com/gp/product/0323017029/ref=as_li_ss_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=0323017029&linkCode=as2&tag=daynightrever-20

The above is an ultrasound requisites series book. The radiology requisites series is pretty popular and well regarded. I found it quite useful.

If you are planning to be a procedural oriented radiologist, or go into IR later. I recommend

this....https://www.amazon.com/dp/143771417X/ref=as_li_ss_tl?ie=UTF8&linkCode=sl1&tag=daynightrever-20&linkId=521eba90123660ea6bb3af27fa3febfd

I always have felt that ultrasound is only as good as the user. So technique is important. For this just general practice is good. However a very good understand of the views and anatomy in ultrasound is important. Ultrasound anatomy is less defined compared to CXRs, or CT/MR. Mainly because it is often a real time analysis, that is subjected to large amounts of human error based on your own(or a tech's) technique. As such, understanding the anatomy well is important so you know what you are doing.

Always follow the basic principles.in ultrasound WHERE are you, WHERE do you want to go, HOW do you get there, CAN you get there without having the patient moving positions , SHOULD you move the patient if you need different views. WHy do you need different views. ARE you confident in the diagnostic efficacy without continuing u/s analysis.

These two books aren't necessarily "radiology" level, as a physiican. They are more geared towards techs and midlevels. But are good for a good introductory text/review. https://www.amazon.com/Ultrasound-Teaching-Manual-Performing-Interpreting/dp/3131110430/ref=sr_1_8?ie=UTF8&qid=1480490856&sr=8-8&keywords=ultrasound

This atlas is decent, I always found it to be a great reference back when I was a resident.

https://www.amazon.com/Color-Atlas-Ultrasound-Anatomy-Berthold/dp/3131390522/ref=sr_1_21?ie=UTF8&qid=1480490961&sr=8-21&keywords=ultrasound+book

Lastly, I'd recommend buying some sort of u/s physics textbook(algebra based) just to give you a working understanding of the technology. And as you move through your training and beyond the baiscs, you can move onto specialzied ultrasound texts. The main ones are usually obstetrics, EM/Trauma, and abdominal(sometimes the latter two are combined, soemtimes 1 and three are combined in one text. You can search around).