I hope this further clarifies my subject.
The following URL is extremely helpful and I use it often. I just visited it to see if there’s a complete list of all the choices that apply for a given search URL but couldn’t find one.
On the page above I was able to find 4 items for “quality_grade=” by searching through the document but I can’t tell if these are all of them.
Having a full list for all the filters would be great. I’m building an Excel model with dropdown menus in order to create an URL more intuitively.