I have two editions. Mees - Revised Edition, and Mees and James, First Edition. But in addition to all else, I would point out that I knew Howard James personally as well as Grant Haist and others and so got a lot of information in discussions and meetings than is published.

After you look at the table I have more information for you.

As for volumetric measure of solids and chemical purity, there is ALWAYS the potential for up to 20% error regardless of chemical, and regarding purity, I test my own.

As for liquids in a teaspoon or tabelspoon, there is the meniscus to consider. That is why a graduate cylinder is transparent, or didn't you know that.

Also important is whether the liquid is wt/vol or vol/vol or wt/wt, all three of which are used commonly for solutions. Generally, viscosity and illumination level are used as criteria as to which is used in a professional darkroom.