Obtaining values from inside a HTMLDocument

I have a HTMLDocument object.  I would like to obtain the contents of the fifth column on a row inside a table where the third column of the row has some text "abc/xyz"

What is the best way to iterate through all the tables in the document and then for each table iterate through the rows and for each row to iterate through the columns.
I think I can get all the tables by the GetElementsByTagName but I don't see any easy way to iterate through the rows in each table that function returns or the columns in each row.