Field photograph of the **Texas Historical Commission** historical marker for the **Three Rivers Glass Company** (**circa 1920–1936**) at **Three Rivers, Texas** — the **South Texas glasshouse** whose **square vacuum jars** (**Crystalvac** packaging family) and other bottles **Hoffmann-Hayman** filled in San Antonio; **supplier-plant documentation** on **location**, **not** a photograph of the **Delaware Street coffee factory** itself — project reference frame (**Instagram 2017** outing; companion copy on **[Three Rivers Glass bottles]({{ site.baseurl }}/bottles/)**)