An overall new investigation on early bronze drums : coping with the sharp increase in the number of new specimens

在古铜鼓分布最密集的越南，15年间发现的铜鼓数量增加了2.5倍。该项目的最初目的是适应最近物质条件的急剧变化。但在现场发现，包括海外市场在内，大部分都流入了古董市场，甚至连越南考古学家也不知道真正的主人。”因此，我们不得不把我们的目标转向切实可行的科目；概述了近期发现的分布、Heger I型的区域特征，特别是泰国和马来西亚的地区特征和铸造技术，对铭刻日期的标本和青铜器研究历史上的重要标本进行了详细调查。我们可以在这些科目上取得实质性的成果

In Vietnam, where ancient bronze drums are most densely distributed, the number of discoveries increased to as many as two and half times during these 15 years. The original aim of this project was adaptation to this recent drastic change in material condition. We found, however, in the actual field, that most of the finds had flowed into antique market including overseas one and that even Vietnamese archaeologists could not know the actual owners. So, we were obliged to shift our target to practicable subjects ; outline of the distribution of the recent finds, regional traits in the Heger I type especially that of Thailand and Malaysia and casting technique, minute investigation of the specimens with inscribed date and important ones in the history of bronze drum research. We could attain substantial results in these subjects