Linear Drag Coefficient

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I'm trying to model the flight of a small spherical object (such as a ping-pong ball) through air at smallish velocities ($\approx 5{_{m/s}}$) with linear drag so that $F_{d}=-bv$. The problem is, I can't find a table of linear drag coefficients ($b$) anywhere; it's always just the normal drag coefficient $C_{d}$ which is for when the drag force is proportional to $v^2$. I don't think you can just use $C_{d}=b$ since they have different units.

However, I came across this, which I think is saying that $b=6\pi \mu R$, which would be good since I could look up $\mu$ from say, here. Does that seem like a good idea?