1927 Essex Instruction Book (Oct. 1927 - 2nd Series) - we also have a 1927 first series (Jan);
Filed in 1920-1929 Manuals:
A Hudson in the First World War by John Dyson - this is an interesting 8 page article about the adventures of Sir Alfred ‘Toby' Rawlinson driving a 1913 Hudson in France during WW I - filed in General;
1927-1942 Numerical Parts Price Catalog. Filed under 1920-1927 manuals.
While the prices are a tad out of date (you can either dream or cry!!) this catalog, like the 1927-1939 Parts Price Catalog and 1927-1950 Hudson Numerical Parts Interchange Catalog, can be used for parts interchange among Hudson built cars. I know the 1927-1942 manual is searchable - I think the other two are also. Simply type the part number into a search box.

Hudsonly,
Alex B