Reddit mentions of Sepher Rezial Hemelach: The Book of the Angel Rezial

Raziel is probably most famous for the book he gave to Adam. There are many versions of the story, including one where angels steal the book back from Adam out of jealousy. It supposedly passed through the hands of Enoch, Noah, and Solomon, inspiring the Book of Enoch, teaching Noah how to build the Ark, and granting Solomon great knowledge and power in magic respectively. Source

The origin of this story is pretty interesting: "The myth of the Book of Raziel grows out of a midrash attempting to explain the verse, This is the book of the generations of Adam (Gen. 5:1)." Source, also a good read

Raziel is mentioned in Targum Ecclesiastes 10:20 - "Do not speak evil of the king in thy conscience, nor in the secret of thy heart, nor in the most hidden place in thy house, curse not a wise man; for Raziel calls daily from heaven upon Mount Horeb, and his voice goes through the whole world; and Elijah, the great priest, goes, flying through the air like a winged eagle, and publishes the words which are spoken in secret by all the inhabitants of the earth." The Targumim are pretty old - they date back to the 1st to 7th centuries. This page offers an interesting theory about Raziel's early role in Jewish mysticism - not as the keeper of secrets but rather the revealer.

According to Maimonides (1135-1204) in his Mishneh Torah, Raziel is the chief of the order of Erelim, also the herald of God and preceptor of Adam.

Now, there is a 13th century medieval grimoire known as "Sefer Raziel HaMalakh". The true author is unknown, but it's commonly attributed to Eleazer of Worms or Isaac the Blind, medieval writers of the time. It draws heavily on Sefer Yetzirah and Sefer Ha-Razim, the former being the oldest and probably the most important Qabalistic text.

As for the Sefer Raziel itself, you can read it online here. Steve Savedow's translation is unfortunately not great, the amazon reviews sort of speak for themselves, but it's better than nothing. You may find something interesting there.

tl;dr Raziel is a very old and important angel, considering he derives from Genesis 5:1. If you are trying to connect to angels in a Qabalistic context, I'd highly recommend starting with the books they originated from, like Sefer Raziel and its predecessors. Hope this helps.

Thank you for getting the joke.

I would not really advise to solely look at Enochian Text for this, you might want to start looking at
A Dictionary of Angels for some good baseline info
and the Sepher Rezial Hemelach

Fifth World Books - 419 E. 2100 South, SLC, UT. Ph.(801)486-6437 Will often know where to point you as well. Rosenblum's World of Judaica on Devon St. In Chicago can direct you as well as get you some very hard to find reference books.

Hope those can give you some more diverse and accurate sources of information.

EDIT: Also of course the Sefer Yetzirah: The Book of Creation and The Magician's Companion