I have many photos of this family that I would be glad to post that were wonderfully identified back in the early 1900s by the wife of Adolph Egerer, one of their sons. I've never tried to attach a photo to one of these messages so we can call this a test. If this works, I'll be glad to post more as time permits or if anyone would be interested.
This particular photo includes two Egerer brothers that I know of. William is second from left and Adolf is on the far right. Highland Bakery could very likely have been in the St.Louis area on the Illinois side. There was a Highland Bakery in Highland Park, IL. Hillsboro IL was a residence of at least Carl Egerer and Adolph at one time. If anyone knows the year that William went to California that would help date this photo.