 There is a lack of copyright differentiation between the works produced during Edward Marshall Boehm's lifetime, 1951–1969 and the works done after his death by the Boehm firm.In 1969 Helen directed the creation of "The Bird of Peace", later gifted to China during Nixon's historic 1972 visit to the country.The firms' artisans created a porcelain copy of the wedding bouquet of Diana, Princess of Wales and crafted a white rose in her memory following her death.