The recipe for Salid (sic) Dressing calls for Eagle Brand Milk, generally known as Eagle Brand Sweetened Condensed Milk. I wondered if that could help me date this recipe book. It can't.
The company's website tells me that Eagle Brand Milk was first introduced in 1856 -- and my grandmother wasn't born until 1893. Eagle Milk had been around almost 40 years by the time she was born.
This recipe also calls for a raw egg, an ingredient most of us would shun these days for fear of salmonella. The ingredients suggest to me that this is a mayonnaise type dressing that would be great for cole slaw (if only the egg were cooked). Maybe salmonella was less of a problem a hundred years ago, before egg factories.