List 1. Catalogue (number/name, type, and size) of all circular rules. No photos.
List 2. Catalogue (number/name, type, and size) of all linear rules. No photos.
Also partial Archive (66 models) with photos.

List 1. Catalogue (dates, name, size & scale layout) of all models in all standard ranges. No photos.
List 2. Catalogue (number, customer, use) of all Specially Commissioned models. No photos.

List 1. Catalogue (name, type & scale layout) of all models from the Sub-Ivory range. No photos.
List 2. Catalogue (name, type & scale layout) of all models from the Honduras range. No photos.
Also partial Archive (15 models) with photos.

List 1. Complete list of D & P models prior to 1935, with limited information for each rule. No photos.
List 2. Complete list of Aristo models after 1935, with limited information for each rule. No photos.
Also partial Archive (279 models) with photos.

Cross reference. Complete list of models, with detailed information for each rule. No photos.
Babcock Dietzgen Matrix Cross reference matrix of Dietzgen rules.

List 1. Complete list of models prior to 1935, with limited information for each rule. No photos.
List 2. Complete list of models after 1935, with limited information for each rule. No photos.
Also partial Archive (347 models) with photos.

Archive Catalogue of the range of Graphoplex Rules with photos.

Cross reference. Complete list of models, with detailed information for each rule. No photos.
Also partial Archive (283 models) with photos.
And the following references from Mike Syphers Ref 1 and Ref 2
See also Jay Ballauer's very impressive continuing work on K&E rules Ref 3

List 1. Catalogue (type, scale layout & use) of all models from the Imperial range. No photos.
List 2. Catalogue (type, scale layout & construction) of all models from the Metric range. No photos.
List 3. Catalogue (type & contents) of all models from the Set range. No photos.
List 4. Catalogue (size, name & usage) of all models from the Specially Commissioned range. No photos.
List 5. Catalogue (retailer & model) of all models from the Original Equipment Manufacturer (OEM) range. No photos.
Also partial Archive (68 models) with photos.

List 1. Complete list of models prior to 1955, with limited information for each rule. No photos.
List 2. Complete list of models after 1955, with limited information for each rule. No photos..
List 3. Complete list of known circular models, with limited information for each rule. No photos.

Cross reference. Complete list of models, with detailed information for each rule. No photos.

Archive 1. Chart listing all Frederick Post slide rules by model number and year sold.
Archive 2. Sphere Research Slide Rule Site / POST Archive.

Archive 1.Complete list of models, with photo and detailed information for each rule.
Archive 2. List of models with no known model numbers.

List. Catalogue (number/name, type, size & scale layout) of all linear models. No photos.
Also partial Archive (48 models) with photos.