Is this for design?
----No, it's for mechanics and materials. I need a number.
Let's look in Knovel Answers. Click on Research by Subject, then Mechanical Engineering, then Knovel Answers. In the Search Box, type "douglas fir modulus of elasticity." The first result listed, "Tabulated Design Values for Visually Graded Lumber" might be what you need. Let's look at it. There are 26 types of douglas fir graded.
---I think I'll take the value of the one in the middle of the table. That number looks about right. Thank you very much.