Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

Q: A wonderful pictorial book about transistor radios, 175 of them, not only photographed but put in the context of fifties and sixties design. The spread on 60-61 shows six radios mixed with close-up photos of chrome styling from fifties cars. I loved the chapter on design with its photos of grills and lettering, even a spread on 9-volt batteries.This is the kind of book that Chronicle do so well, interesting subjct, well designed and printed all for the general reader. If you collect these radios you will certainly want to have a copy but don't expect to get lots of technical detail or a price guide. For that have a look at 'Collector's Guide to Transistor Radios' by Marty and Sue Bunis, plenty of text about seven hundred models, some photos and that all-important identification and price information.

A: Positive
****
Q: Jack Higgins may not be running out of his fascination with modern weapons, fine dining, glamorous women or the IRA but he appears to be slipping on plot and character development. Sean Dillon makes Doc Savage and Dirk Pitt look like pikers. And this curious extension of gentlemanly methods for attempting to kill one another -- sending a crazed assassin and then both sides meeting later at the Savoy to exchange notes -- strains credulity.Higgins has done some first-rate work. Had this been published twenty-five years ago, this might have made a difference. It wasn't and it doesn't.

A: Negative
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Q: There's not much learning either. Sheri is incredibly condescending when she mimicks pregnant women. This video could also really use some visual aids besides Sheri holding up a poor illustration, writing lists (that she doesn't finish) on a whiteboard and the worst...her on the ground, legs spread in high-waisted khakis demonstrating childbirth.

A:
Negative
****