Volume no.6 of the Profile & Scale series illuminates the various Polikarpov fighters of the Spanish Civil War (1936-39). The book is fully bi-lingual Spanish and English text, to include all captions, descriptions and references. More than 70 full-colour profiles document the appearance of these famous I-15s and I-16s, or Chatos and Moscas, in unstinting detail and accuracy. All-original, never previously published 1:48 scale line drawings are provided for the I-15 from all three manufacturers, Russian and Spanish. Full scale plans are included for the I-16 Types 5 and 10, but also for the special Ispanskii hybrid version shipped to Spain and the locally built examples from Alicante. These line drawings are the culmination of nearly 30 years' dedicated work on Polikarpov aircraft, and should present the most complete, accurate and illuminating scale work regarding these machines to date. The book presents many production, development and detail facts about Polikarpov fighters in Spain which have not been published previously. The old myth of the I-16 "Type 6" is laid to rest at last, and the mysterious Ispanskii models finally revealed. A proper explanation of the Russian M-25 engine is presented along with other such technical details, making this volume a treasure-trove for variant identification and resolution.