The Shattered Helmet is Volume 52 in the original The Hardy Boys Mystery Stories published by Grosset & Dunlap. This book was written for the Stratemeyer Syndicate by Andrew E. Svenson in 1973.
The Shattered Helmet is Volume 52 in the original The Hardy Boys Mystery Stories published by Grosset & Dunlap. This book was written for the Stratemeyer Syndicate by Andrew E. Svenson in 1973. (en)
The Shattered Helmet is Volume 52 in the original The Hardy Boys Mystery Stories published by Grosset & Dunlap. This book was written for the Stratemeyer Syndicate by Andrew E. Svenson in 1973. (en)