linked - Investigating the Terror

Williams testified at the Salameh trial to the VOD of urea nitrate:
Urea nitrate in smaller quantities detonates at a velocity of about
14,000 feet per second. The larger quantity that you get of urea
nitrate it compacts on top of itself and may approach 15,500 feet
per second.
When asked at his OIG interview the basis for these figures, Williams
stated that they were a rough estimate from information I had obtained
from different sources. The information was allegedly received orally
from persons Williams regarded as knowledgeable sources within the
field of explosives. These sources told him, [I]t's approximate. These
fellows had not worked with it. And wherever they got the information
from, this is what I had received from them. Williams told us there was
very little literature on the subject. He continued:
And the actual written material that I found was -- it was a very
broad definition. It didn't seem that two people agreed on the
same thing. . . .
[Question by OIG:] That literature indicated that it was unclear as
to what the velocity of detonation was?
AGENT WILLIAMS: Not unclear. There was just such a wide
parameter of detonations and pressure. Very little research had
been done and written about that I was able to locate.
OIG: And it was wider than 14,000 to 15,500 feet per second; is
that correct?
AGENT WILLIAMS: I don't recall.
OIG: You don't recall that -- I mean, the literature did not reflect
14,000 to 15,500 feet per second; is that right?