While obtaining the digital file is legally difficult, the theory is available. By reading summaries, journal papers by Haugen (specifically "The Low Volatility Anomaly" from the Financial Analysts Journal), and modern factor investing books, you can replicate the knowledge.
His seminal paper, "The Incredible January Effect," and his subsequent textbooks argued that the stock market is not perfectly efficient. This led to the publication of the first editions of in the 1990s, a text that became required reading at top-tier MBA programs. Robert Haugen Modern Investment Theory.pdf
Haugen argued that if markets were truly efficient, professional money managers would not consistently beat the market. Yet, he presented data showing specific anomalies persist for decades. While obtaining the digital file is legally difficult,