In an era when only decaying remnants line the riverbanks of Rust Belt cities, it may be hard to remember how much steel production once symbolized modernity. And most who remember iron and steel think of them as well-defined and discrete entities. But in their heyday, iron and steel industries produced an array of metal products with subtle metallurgical variations. These variations allowed firms to specialize, and specialization sometimes carried with it the temptation to avoid costly adaptations to technological change. This seems to be the story of Ohio's Mahoning Valley—the Greater Youngstown region. While the region had already become one of the country's most important metal-making centers in the antebellum era and persisted as an industrial powerhouse well into the twentieth century, most of its iron and steel firms seemed to be a day late and a dollar short compared with industry leaders in technological innovation.

Iron Valley offers a detailed chronological account of the many iron and steel firms of the region from the early 1800s up to the eve of World War I. At each stage of the story, most of the local entrepreneurs and firms the author describes proceeded cautiously, taking advantage of the proximity of both coal and iron ore deposits to create profitable niches for themselves but avoiding the costliest capital investments in the latest technology. Thus, as antebellum firms in nearby Pittsburgh set up rolling mills to refine pig iron and then manufacture finished metal products, most firms in the Mahoning Valley stuck to pig iron furnaces hoping to supply Pittsburgh rolling mills. In the 1870s and 1880s they were likewise slow to shift to the Bessemer converters that others in the industry adopted. As steel production increasingly began to replace wrought iron in late nineteenth-century America, many Mahoning Valley firms sought to fill market niches in specialty products still made with iron rather than steel. By the World War I era, large national steel corporations had taken over much of the local industry, while remaining niche iron producers struggled to survive.

Clayton J. Ruminski presents this story in six chronological chapters. Chapter 1 documents how local metalworking firms fitfully rose and fell before 1840. Chapter 2 describes how development of nearby coal deposits offered greater prosperity between 1840 and 1856. In Chapter 3 the author explains the importance of expanding railroad networks in the Civil War era. Chapter 4 analyzes how the 1870s depression stymied postwar expansion. Chapter 5 describes how local firms resisted investment in new technologies as the industry shifted toward newer steelmaking processes in other, often nearby locations like Pittsburgh and Cleveland. In Chapter 6 we see the reckoning in the years just before World War I, when local firms struggled to survive.

Some topics receive less attention than I had hoped. Perhaps it is because I specialize in labor history, but I would have liked to learn more about the labor force and labor processes. The author discusses strikes and labor conflict but says little about the people who made the products.

While the author offers a number of suggestions for the pattern of resistance to change and innovation he documents, at the end I wasn't sure I understood why the story came out as it did. The author demonstrates voluminous primary research and a dizzying level of detail, but I could never quite put my finger on an explanation for this persistent pattern. Part of the problem is that large portions of the text are not explicitly argument driven. Rather, there is an unending array of this firm and that firm with this and that level of capitalization and this company president born here and there with previous experience in this and that firm. Reading it seemed like a slow go to me. I expect that readers with regional historical interests may find the volume more fruitful than those who want to understand industry-wide patterns of change.