Amer. style Bronze ( W-- F.T.-- Tango and VW. ) have many similarities in content, and many that are identical.
W. uses Nat and rev turns, -- closed changes and even a spin turn .
In some cases, the names are changed . left and right are mostly used for direction.
In FT ," think " 1/4 turns as a basic concept and from that, develop prom. figures and nat. and rev. turns .The speed of the music can also vary greatly .
Primarily, the beginners level ( prel. br. ) is kept quite simple. The objective is to get people up dancing as soon as poss. techn. is kept to a minimum in class work, but can be as complex as Intern. style as one goes on .
Tango, is unlike anything that we teach here ( altho, I use the american system in my classes ).It is much closer to the original form, than the far more rigid approach we use .
I did a lecture and brief class at a national congress here 2 yrs ago, on the Amer. style Silver W and FT..( 4 basic variations in each )
it was met with very good response-- in fact its now being taught in several areas of the country .
As to your ref. on techn. books, there was a manual put out by the old US ballroom council which had the 13 dances in BR- Silv and Gold written in techn. form .
there are now several different ones available .